WO2022194684A1 - Unité d'entraînement pour une bicyclette électrique, comprenant un support d'engrenage pour le montage d'engrenages de deux étages d'engrenage - Google Patents

Unité d'entraînement pour une bicyclette électrique, comprenant un support d'engrenage pour le montage d'engrenages de deux étages d'engrenage Download PDF

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Publication number
WO2022194684A1
WO2022194684A1 PCT/EP2022/056283 EP2022056283W WO2022194684A1 WO 2022194684 A1 WO2022194684 A1 WO 2022194684A1 EP 2022056283 W EP2022056283 W EP 2022056283W WO 2022194684 A1 WO2022194684 A1 WO 2022194684A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
drive unit
housing
bearing
unit according
Prior art date
Application number
PCT/EP2022/056283
Other languages
German (de)
English (en)
Inventor
Christian Brüggemann
Mick Jordan
Peter Tenberge
Kevin ZYSKA
Richard FRIZLER
Original Assignee
Brose Antriebstechnik GmbH & Co. Kommanditgesellschaft, Berlin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brose Antriebstechnik GmbH & Co. Kommanditgesellschaft, Berlin filed Critical Brose Antriebstechnik GmbH & Co. Kommanditgesellschaft, Berlin
Priority to EP22713933.4A priority Critical patent/EP4308444A1/fr
Priority to CN202280021753.3A priority patent/CN117043050A/zh
Priority to US18/550,053 priority patent/US20240158047A1/en
Publication of WO2022194684A1 publication Critical patent/WO2022194684A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/55—Rider propelled cycles with auxiliary electric motor power-driven at crank shafts parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
    • B62M11/145—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears built in, or adjacent to, the bottom bracket

Definitions

  • the proposed solution concerns a drive unit for an electric bicycle.
  • a corresponding drive unit has a drive shaft (typically also referred to as a bottom bracket shaft), via which a drive torque generated by a rider of the electric bicycle can be introduced and on which pedals are provided for this purpose.
  • a drive shaft of the drive unit Via an output shaft of the drive unit to be coupled to a wheel of the electric bicycle, in addition to a drive torque introduced by muscle power on the drive shaft, an electric motor and thus externally generated torque can be transmitted to a wheel, usually a rear wheel of the electric bicycle.
  • the at least one electric motor and the output shaft are coupled to one another via the transmission device of the drive unit.
  • a proposed drive unit for an electric bicycle includes at least
  • a housing accommodating the electric motor and the transmission device.
  • the drive unit comprises a gear carrier fixed in the housing, on which at least one gear wheel of a first gear stage and at least one gear wheel of a second gear stage are rotatably mounted.
  • a gear carrier is thus fixed in a housing of the drive unit, on which gears of different gear stages are rotatably mounted.
  • the transmission carrier thus takes on several functions, which means that installation space, weight and costs can be reduced.
  • a roller or plain bearing is held, for example, in the bearing opening of the gear carrier.
  • a corresponding roller bearing or plain bearing can consequently be mounted on the gear carrier.
  • the first gear has a first bearing section which extends axially with respect to an axis of rotation of the first gear and protrudes into the bearing opening of the gear carrier and on which a roller or plain bearing held in the bearing opening is provided.
  • the axially extending first bearing section can be formed, for example, by a sleeve-shaped axial extension on the first gear.
  • the first gear can have a second bearing section which extends axially with respect to an axis of rotation of the first gear and which is additionally rotatably mounted on a section of a housing of the drive unit. Consequently, a bearing seat for an additional rolling bearing or plain bearing for the rotatable mounting of the first gear wheel via the second bearing section can be provided on the housing.
  • the gear carrier has, for example, a bearing journal.
  • a roller or plain bearing can be provided on this bearing journal for the rotatable mounting of the second gear wheel.
  • an inner ring of a roller bearing provided on the bearing journal is fixed in a rotationally fixed manner on the bearing journal.
  • such an inner ring protrudes into a (second) bearing seat formed on the interior side of a housing outer wall of a housing of the drive unit.
  • a corresponding engagement of the inner ring of the roller bearing can serve to provide additional stabilization of the transmission carrier during operation of the drive unit and to facilitate the intended (pre-)positioning of the bearing journal within an interior space of the housing during assembly.
  • the transmission carrier can be designed in the form of a plate.
  • the transmission carrier is consequently a separate, plate-shaped component which is fixed to a housing part of the housing during assembly of the drive unit, for example by means of several (at least two) fastening elements such as screws or bolts.
  • a bearing journal for the second gear wheel can be formed on such a plate-shaped gear carrier so as to protrude in the direction of an outer wall of the housing.
  • Such a bearing pin protruding in the direction of a housing outer wall enables, for example, a separate fixing of the bearing pin to the housing outer wall for additional support via the second gear wheel during operation of the drive unit on the forces acting on the bearing pin.
  • an embodiment variant provides that the bearing pin protruding in the direction of the outer wall of the housing is fixed to the outer wall of the housing via a locking element that is accessible from outside the housing.
  • Such a locking element can thus be attached to the outer wall of the housing from the outside during assembly of the drive unit in order to fix the bearing journal of the transmission carrier present within the housing on the outer wall of the housing and thus additionally on the to support the outer wall of the housing.
  • a locking element can be releasable, for example.
  • a locking element is formed by a (bearing) screw. A corresponding bearing screw is then screwed, for example, from outside the housing through a through-opening provided on the outer wall of the housing into a bore of the bearing journal.
  • the gear carrier has a bearing opening for the rotatable bearing of a gear shaft connected to the first gear.
  • This transmission shaft which is arranged coaxially with the motor shaft, for example, is part of a first transmission stage which interacts with the motor shaft of the electric motor and from which torque is to be transmitted in the direction of the output shaft to the second transmission stage. Consequently, the first gear wheel can be fixed in a rotationally fixed manner on the transmission shaft.
  • the transmission shaft is additionally rotatably mounted on a section of a housing of the drive unit.
  • the transmission shaft is then held and supported here in a rotatable manner via two bearings, on the one hand via a bearing on the gear carrier and on the other hand via a bearing on the housing.
  • a bearing seat for an additional roller or plain bearing for the rotatable mounting of the transmission shaft is provided on the housing on the interior side (that is, within an interior space of the housing).
  • the shaft end of the transmission shaft for example, is then rotatably mounted via such an additional roller bearing or plain bearing on the bearing seat on the housing side.
  • the transmission device has a planetary gear with a sun gear, a ring gear and a plurality of planetary gears rotatably mounted on a planet carrier of the planetary gear. It is provided here, for example, that the motor shaft of the electric motor is connected to the sun gear of the planetary gear and a torque can be transmitted from the motor shaft to the planetary carrier via the fixed ring gear.
  • a transmission shaft mentioned above, which is connected to the first gear in a rotationally fixed manner, is then, for example, part of the rotatable planetary carrier
  • the transmission device a spur gear with first, second and third spur gears for the transmission of a (on the torque generated by the electric motor on the motor shaft) torque from the Include planetary gears to the output shaft.
  • a first spur gear forms the first gear and can be driven by the planet carrier.
  • a second spur gear of the spur gear forms the second gear and meshes with the first spur gear and the third spur gear.
  • the third spur gear is in turn connected to the output shaft to provide the additional drive torque.
  • the motor shaft of the electric motor drives the sun gear of the planetary gear and a torque is transmitted to the planet carrier with the help of a fixed ring gear of the planetary gear and from there to the first gear in the form of the first spur gear of the additionally provided spur gear.
  • the additional drive torque is provided at the third spur gear connected to the output shaft via the first spur gear that can be driven by the planet carrier and the second gear meshing with the first spur gear and the third spur gear in the form of the second spur gear.
  • An axis of rotation of the motor shaft, an axis of rotation of the sun gear, an axis of rotation of the planet carrier and an axis of rotation of the first spur gear are arranged coaxially and define a first shaft assembly with an associated first gear stage axis of rotation.
  • Running parallel to this is a second gear stage axis of rotation of a second shaft train of the gear device, which is defined by an axis of rotation of the second spur gear.
  • An axis of rotation of the third spur gear and the axes of rotation of the input shaft and the output shaft running coaxially thereto define a third axis of rotation of a gear stage of a third shaft train, which runs parallel to the first and second axes of rotation of the gear stage.
  • the proposed solution is not limited to a drive unit with a three-stage gear mechanism, in particular not to a gear mechanism with planetary gear and spur gear.
  • the gear carrier is for the rotatable mounting of the planet carrier and the second spur gear provided.
  • the planet carrier and the second spur gear are then rotatably mounted on the gear carrier.
  • the gear carrier thus assumes both the mounting of the planet carrier of the planetary gear and the mounting of the second spur gear of the spur gear.
  • a bearing opening of the gear carrier is provided here for the rotatable mounting of a gear shaft of the planet carrier that is connected to the first spur gear.
  • This transmission shaft which is then arranged coaxially with the motor shaft, is formed on the planetary carrier, for example.
  • the first spur gear is fixed in a rotationally fixed manner on the gear shaft in order to transmit torque from the planetary gear to the spur gear.
  • Both the gear shaft and the first gear wheel can then be rotatably mounted and supported on the gear carrier via a roller or slide bearing held on a first bearing section of the first spur gear.
  • the axially extending first bearing section can thus be formed, for example, by a sleeve-shaped axial extension on the spur gear, through which the transmission shaft of the planetary carrier extends.
  • a bearing seat for the rotatable mounting of the transmission shaft of the planetary carrier is provided on the housing.
  • the transmission shaft can also be held in a rotationally fixed manner, for example, in a second bearing section of the first gear wheel, which is formed by a sleeve-shaped axial extension on the first gear wheel.
  • a roller bearing or slide bearing held in the bearing seat of the housing can be provided on the second bearing section in order to rotatably support both the second gear wheel and the transmission shaft on the bearing seat on the housing side.
  • the output shaft and the drive shaft can be coupled to one another via a freewheel.
  • a user of the electric bicycle can then, for example, pedal freely from a predetermined maximum speed for the electric bicycle (of, for example, 25 km per hour).
  • the output shaft can be connected both to a chainring and to a pulley for driving the wheel of the electric bicycle.
  • a total transmission ratio in the range of 22 to 27 is provided via the transmission device.
  • a total gear ratio between the electric motor and the output shaft is around 25.
  • mutually meshing gears of the transmission device can be helical.
  • the planetary gear can be accommodated in the housing of the drive unit and the stationary ring gear can be mounted.
  • the stationary ring gear of the Planetary gear based on an axis of rotation of the sun gear, only partially supported radially on the peripheral side by the housing. In such an embodiment variant, there is therefore no radial support of the stationary ring gear on sections of the housing that runs completely around the circumference.
  • such a radially outwardly projecting (in the direction of the second gear stage axis of rotation) and, in relation to a support in the radial direction, cantilevered support section of the ring gear is accommodated in a recess in the housing.
  • This recess can be provided in a peripheral bearing edge of a bearing seat of the housing, which is designed for the positive mounting of the stationary ring gear.
  • the ring gear is fixed in this bearing seat by means of a press fit.
  • a recess is then formed, in which the support section of the ring gear engages.
  • an additional anti-rotation device can be provided for the ring gear and the ring gear (with respect to the axis of rotation of the sun gear) can be held on the housing in a torsion-proof manner.
  • a circumferential edge of the ring gear can be locally thickened on the cantilever support section of the ring gear. In the region of the support section, on which no radial support is provided by the housing, an outer diameter of the ring gear is consequently enlarged locally in such an embodiment variant.
  • the local thickening on the support section is then dimensioned, for example, in such a way that the same component rigidity is achieved over the entire circumference of the ring gear.
  • the ring gear can be made of aluminum.
  • the ring gear can also be produced with a metal core and internal teeth made of a plastic material.
  • the ring gear then has, for example, a metal core, for example a steel core, which is (partially or completely) overmolded with plastic material. The metal core is then consequently embedded in the plastic material forming the internal toothing of the ring gear.
  • the housing has two housing parts connected to one another along a parting plane.
  • the housing of the drive unit can also comprise exactly two housing halves and can therefore be constructed in two parts.
  • a two-part construction facilitates assembly and typically leads to a lower weight of the drive unit than, for example, if the housing is constructed from at least three housing parts.
  • a bearing plate with a bearing opening for the rotatable bearing of the motor shaft of the electric motor is provided on the parting plane of the two housing parts.
  • Such a bearing plate then extends, for example, as a plate-shaped component parallel to the parting plane and thus provides a bearing seat for the rotatable mounting of the motor shaft of the electric motor.
  • the end shield additionally has at least one centering section for centering the two housing parts of the housing with respect to the motor shaft. Consequently, the end shield also takes on the function of an alignment aid for the correct positioning of the two housing parts relative to one another when the drive unit is being installed. An additional function is thus integrated into the end shield, which is typically performed by separate cylinder pins in drive units known from practice up to now. With the aid of the at least one centering section on the end shield side, during assembly of the drive unit the housing parts are centered to each other.
  • the housing parts are aligned with one another as intended, in particular when the housing is closed, before the two housing parts are finally fixed to one another, for example at predefined screw points of the housing. This also ensures that the shaft trains of the drive unit are parallel and arranged as intended.
  • the bearing plate-side centering section is accommodated at least partially in a form-fitting manner both on a centering shoulder of a first housing part of the two housing parts and on a centering shoulder of a second housing part of the two housing parts.
  • the centering shoulders of the two housing parts can each be formed on an inner surface of a housing outer wall facing an interior space of the housing.
  • the centering section can, for example, only be accommodated in a form-fitting manner in an alignment of the two housing parts with respect to one another on the centering shoulders of both housing parts.
  • the centering section is designed to protrude axially with respect to the axis of rotation of the motor shaft and extends along a circular path (in the assembled state along a circular path around the axis of rotation of the motor shaft).
  • the centering section can thus be formed, for example, as a circular ring section that protrudes axially (on both sides) on the end shield.
  • the end shield can be pressed onto the two housing parts via an interference fit, in order to ensure that the end shield is securely locked to the housing parts after the drive unit has been installed.
  • the end shield also integrates a cooling shield for dissipating heat from the interior of the housing to an outer wall of the housing.
  • the end shield is thus additionally provided for dissipating heat generated in the interior of the housing to the outside.
  • the end shield can be arranged adjacent to a circuit board (printed circuit board) of the drive unit in an interior space of the housing. In relation to an axis of rotation of the motor shaft, the end shield then follows the circuit board, for example in the axial direction. In this case, the end shield can also bear against the circuit board, at least in sections.
  • a corresponding arrangement of the circuit board to the end shield can be particularly advantageous if the end shield also integrates a cooling shield. In this way, heat can be dissipated from the circuit board and disposed on it via the end shield electronic components that are provided, for example, for controlling the electric motor, are discharged to the outside.
  • the circuit board can extend parallel to the parting plane of the two housing parts. This can also further simplify the assembly of the drive unit, since the circuit board can be positioned in this way during assembly on an open side of a housing part.
  • electronic components arranged on the circuit board for controlling the electric motor include at least one sensor for electronically determining a position of the motor shaft with respect to a stator of the electric motor.
  • the at least one sensor can be arranged on the circuit board at a radial distance from the motor shaft with respect to the axis of rotation of the motor shaft.
  • the corresponding embodiment variant consequently provides a so-called off-axis sensor arranged on the side for the electronic determination of the position of the motor shaft in relation to the stator of the electric motor.
  • the end shield which is arranged adjacent to the circuit board, can have several (at least two) recesses, for example in the form of through openings, for electronic components arranged on the circuit board. In this way, electronic components that are possibly taller can protrude into recesses in the end shield or extend through them.
  • the proposed solution also includes an electric bicycle with an embodiment variant of a proposed drive unit.
  • FIG. 2 is a perspective view of individual parts of the drive unit without a housing accommodating them, to illustrate the interaction of the electric motor via a transmission device comprising the planetary gear and the spur gear with an output shaft of the drive unit;
  • FIG. 3 shows a further sectional view of the drive unit, showing only one of two housing parts of the housing of the drive unit;
  • FIG. 4 shows the one housing part also shown in FIG. 3 with elements of the planetary gear and the spur gear received therein;
  • FIG. 5 shows a perspective view of the other housing part, not shown in FIGS. 3 and 4, with a view of a circuit board accommodated in the housing and an end shield arranged in a parting plane between the two housing parts.
  • FIGS 1 to 5 show an embodiment variant of a drive unit A for an electric bicycle in synopsis.
  • the drive unit A is to be provided, for example, as a so-called central motor on an electric bicycle.
  • An additional drive torque which is made available by an electric motor E of the drive unit A, is made available to an output shaft AT via the drive unit A.
  • the output shaft AT is then connected to a sprocket or belt wheel, for example, in order to make an output torque available to a wheel of an electric bicycle.
  • the output shaft AT is arranged coaxially with a bottom bracket shaft T in a manner known per se.
  • Pedals are provided on the shaft ends of this bottom bracket shaft T, which extends through a housing G of the drive unit A, when it is mounted on the electric bicycle as intended.
  • a driver of the electric bicycle can use this to introduce a drive torque into the bottom bracket shaft T using muscle power.
  • this drive torque generated by muscle power is made available to the output shaft AT together with an additional drive torque generated by the electric motor E by external force.
  • the output shaft AT is coupled with the bottom bracket shaft T via a freewheel, which allows free pedaling from a specified maximum speed of the electric bike, for example 25 km per hour.
  • the drive unit A has a three-stage gear device with a planetary gear 1 and a spur gear 2 .
  • the planetary gear 1 and the spur gear 2 are completely accommodated within the housing G.
  • the planetary gear 1 has a sun gear S, a stationary ring gear 10 fixed in the housing G and a plurality of planet gears P1, P2 and P3 rotatably mounted on a planet carrier 11 of the planetary gear 1.
  • the sun gear S and the planet carrier 1 are rotatably mounted about a first gear stage axis of rotation L1 and are therefore part of a first shaft train of the three-stage gear device 1, 2.
  • a motor shaft MW of the electric motor E is arranged coaxially with the sun gear S and a gear shaft 110 of the planet carrier 11.
  • the motor shaft MW of the electric motor E can thus also be rotated about the first gear stage axis of rotation L1.
  • the sun gear S is non-rotatably connected to one end of this motor shaft MW, so that the motor shaft MW of the electric motor E drives the sun gear S and transmits torque to the planetary carrier 11 and its transmission shaft 110 via the stationary ring gear 10 .
  • a first spur gear 21 of the spur gear 2 is non-rotatably connected to the gear shaft 110 of the planet carrier 11 .
  • This first spur gear 21 meshes with a second spur gear 22, which is arranged as an intermediate gear of the spur gear 2, between the first spur gear 21 and a third spur gear 23 of the spur gear 2, which is non-rotatably connected to the output shaft AT.
  • the second spur gear 22 is rotatably mounted in the housing G about a second gear stage axis of rotation L2 and thus defines a second shaft assembly.
  • the third spur gear 23 of the spur gear 2 can in turn be rotated together with the output shaft AT about a third gear stage axis of rotation L3 and is therefore part of a third shaft train of the drive unit A.
  • the bottom bracket shaft T which is arranged coaxially with the output shaft AT, can then also be rotated about this third gear stage axis of rotation L3.
  • the housing G is composed of two housing halves G1 and G2, which are connected to one another along a parting plane TE.
  • the housing G of the drive unit A shown is accordingly constructed in two parts.
  • the two housing halves G1 and G2 are centered on one another via an end shield 8 arranged on the parting plane TE and are thus aligned with one another as intended during assembly of the drive unit A and with respect to the gear stage rotational axes L1, L2 and L3 (and thus in particular the rotational axis of the motor shaft MW).
  • the bearing plate 8 arranged on the parting plane TE has a centering section in the form of a centering collar 80 which extends along a peripheral edge of the bearing section 8 in the manner of a circular ring section.
  • the centering collar 80 protrudes axially on both sides and thus in the direction of both housing halves G1 and G2 on the bearing plate 8 with respect to the gear stage axis of rotation L1.
  • the centering collar 80 can be positively received in opposite centering shoulders G18 and G28 of the two housing halves G1 and G2.
  • the centering shoulders G18 and G28 are each designed as recessed depressions on an inner side of an edge section of the respective housing half G1 or G2.
  • the end shield 8 In addition to a centering function, when the drive unit A is in the assembled state, the end shield 8 also assumes a bearing function for the motor shaft MW of the electric motor E within an interior space I of the housing G.
  • the end shield 8 has a bearing opening 82 in which a roller bearing 4.2, here in Form of a ball bearing, is held for the rotatable bearing of the motor shaft MW.
  • the bearing plate 8 is here arranged between the electric motor E and the shaft end of the motor shaft MW carrying the sun gear S.
  • the motor shaft MW is rotatably mounted via a further roller bearing 4.1, here also in the form of a ball bearing, on a bearing seat formed on the interior side of one housing half G1.
  • a circuit board 9 is arranged between the end shield 8 and the electric motor E in the area of the parting plane TE.
  • the end shield 8 borders on the circuit board 9 on.
  • the end shield 8 also integrates the function of a cooling shield.
  • the end shield 8 has a plurality of surface sections 83a, 83b and 83c for heat dissipation and transmission.
  • several recesses in the form of through openings are provided on the end shield 8, into which electronic components of the circuit board 9 can protrude.
  • a sensor 90 of circuit board 9 is also accommodated in one of the recesses of end shield 8 .
  • This sensor 90 is used to determine a rotor-starter position and thus a determination of the position of the motor shaft MW relative to a stator of the electric motor E for the electronic control of the electric motor E during operation of the drive unit A.
  • the sensor 90 is present as an off-axis Sensor formed and (relative to the axis of rotation of the motor shaft MW) spaced radially from the motor shaft MW and thus arranged laterally.
  • the motor shaft MW which extends through the circuit board 9 and the bearing plate 8, drives the sun gear S of the planetary gear 1, so that via the planetary gears P1 , P2 and P3 of the planet carrier 11 and its transmission shaft 110 can be rotated.
  • the electric motor E is arranged in one (first) housing half G1
  • the planetary gear 1 and the spur gear 2 are accommodated in the other (second) housing half G2.
  • the ring gear 10 is pressed into the second housing half G2.
  • the support section 100 is provided on the ring gear 10 in a region of the ring gear 10 which, relative to the axis of rotation of the motor shaft MW, lies in the radial direction between the second gear stage axis of rotation L1 and the third gear stage axis of rotation L3.
  • a peripheral edge of the ring gear 10 is locally thickened on the cantilever support section 100 .
  • An outer diameter of the ring gear 10 is thus locally enlarged on the support section 100 compared to the other sections of the peripheral edge of the ring gear 10, which are pressed into the housing half G2.
  • the ring gear 10 shown can also be made of aluminum to reduce the weight or have a metal core overmoulded with plastic material, the plastic material then forming in particular the internal toothing 101 of the ring gear 10 .
  • the gear shaft 110 of the planetary carrier 11 is rotatably mounted on a plate-shaped gear carrier 3 of the drive unit A within the interior space I of the housing G together with the first spur gear 21 fixed thereto in a torque-proof manner.
  • the plate-shaped gear carrier 3 is fixed to the second housing half G2 via a number of fastening elements B, for example screws (also compare FIGS. 2, 3 and 4).
  • the bearing opening 34 holds a roller bearing 4.3, here also in the form of a ball bearing, via which the transmission shaft 110 and the first spur gear 21 are rotatably mounted.
  • An inner ring of the roller bearing 4.3 is provided on a sleeve-shaped first bearing section 210a of the first spur gear 21 which extends axially in the direction of the sun gear S and through which the transmission shaft 110 extends.
  • the transmission shaft 110 is accommodated in a further, likewise axially extending, sleeve-shaped bearing section 210b of the first spur gear 21 .
  • the shaft end of the transmission shaft 110 protrudes with the second bearing section 210b into a bearing seat G24 of the housing half G2 formed on the interior side.
  • this bearing seat G24 another roller bearing is held 4.4, the inner ring on which sleeve-shaped second bearing portion 210b of the first spur gear 21 is provided.
  • the gear shaft 110 of the planet carrier 11 is rotatably mounted on the gear carrier 3 on the one hand and on the housing half G2 on the other hand.
  • the gear carrier 3 also supports the second spur gear 22 of the spur gear 2.
  • the gear carrier 3 forms a bearing journal 35 that protrudes axially along the second gear stage axis of rotation L2 in the direction of an outer housing wall G27 of the second housing half G2.
  • a roller bearing 5 in the present case in the form of a needle bearing, via which the second spur gear 22 is rotatably mounted on the bearing pin 35.
  • the bearing journal 35 is fixed to the housing wall G27 via a bearing screw 7 that is accessible from outside the housing G.
  • the bearing screw 7 is screwed into a bore of the bearing pin 35 from outside the housing G through a through-opening in the housing wall G27.
  • the bearing journal 35 of the transmission carrier 3 is fixed and supported on the housing wall G2 7 .
  • an inner ring 50 of the bearing 5 protrudes into a recess on an inside of the housing wall G27.
  • a ribbing R is provided on the outside of the housing wall G27. This ribbing R serves to increase the rigidity of the section of the housing wall G27 that is opposite the bearing journal 35, as well as to support the bearing screw 7 on the housing wall G27 with a view to the second spur gear 22 and thus the bearing journal 35 during operation of the drive unit A acting loads.
  • FIG. 2 shows the compact design of the transmission device 1, 2 of the illustrated drive unit A with its three shaft trains and the associated three transmission stage axes of rotation L1, L2 and L3.
  • This also makes it clear once again how, with a comparatively large overall transmission ratio of approx. 25 between the electric motor E and the output shaft AT in the drive unit A, comparatively few mechanically interacting transmission components are required, in particular by dividing certain components, such as the bearing plate 8 and the transmission carrier 3, additional functions are integrated.
  • this also shows once again the comparatively small distance between the different gear stage axes of rotation L1, L2 and L3, which is due, among other things, to the formation of the fixed ring gear 10 with the cantilever support portion 100 is due.
  • the bottom bracket shaft T which is rotatably mounted in the housing G together with the output shaft AT via bearings 6.1 and 6.2, also appears comparatively short compared to the drives for electric bicycles known from practice, since the axial dimensions of the drive unit A can be kept slim .
  • Figure 3 also shows an axially protruding positioning web 38 on the gear carrier 3, via which the gear carrier 3 is centered with respect to the second housing half G2 and in particular the first gear stage axis of rotation L1, before the gear carrier 3 is fixed to the second housing half G2 via the fastening elements B done.
  • the centering of the gear carrier 3 within the second housing half G2 can also be supported by the bearing journal 35.
  • the bearing 5 with an axially protruding inner ring 50 is already mounted on the bearing journal 35 before the gear carrier 3 is attached to the second housing half G2.
  • the protruding section of the inner ring 50 can then be inserted into the bearing seat on the interior side of the housing wall G27, which is formed with the through-opening for the bearing screw 7.
  • FIG. 4 shows the second housing half G2 with the ring gear 10 pressed into it, the cantilever support section 100 of which is received in the recess G20a so as to be secured against rotation.
  • FIG. 4 also clearly shows how the center distance between the gear stage axes of rotation L1, L2 and L3 is kept small due to the cantilevered support section 100 of the ring gear 10.
  • the outer diameter of the second spur gear 22 is already at the level of the outer lateral surface of the ring gear 10.
  • FIG. 5 shows the other, first housing half G1, in which the electric motor E is accommodated, with the bearing plate 8 attached thereto and the circuit board 9 adjoining it (arranged between the electric motor E and the bearing plate 8).
  • the open side of the first housing half G1 also shows a bearing opening G16 in particular, which is provided for the bottom bracket shaft T that extends through the housing G when the drive unit A is in the installed state. Furthermore, FIG. 5 shows screw points G12 distributed on a circumference of the first housing half G10 in the region of the parting plane TE for fixing to the other housing half G2.
  • the drive unit A shown in FIGS. 1 to 5 with a three-stage gear concept is characterized by an extremely compact design.
  • the electric motor E together with the planetary gear 1 and the spur gear 2, is housed in the housing G of the drive A, which is only in two parts, with additional functional integration in a bearing plate 8 and a gear carrier 3 reducing the space requirement and weight compared to the drive units for electric bicycles that have been customary in practice up to now are. Efficient and comparatively simple assembly of the drive unit A is nevertheless ensured, so that an assembly process and a disassembly process, for example for maintenance purposes, are extremely efficient.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)
  • General Details Of Gearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

La solution proposée concerne une unité d'entraînement (A) pour une bicyclette électrique, comprenant - un moteur électrique (E) ayant un arbre de moteur (MW) pour produire, par actionnement par une force externe, un couple d'entraînement supplémentaire, - un dispositif d'engrenage (1, 2) pour le couplage d'un arbre de moteur (MW) du moteur électrique (E) à un arbre de sortie (AT), le dispositif d'engrenage (1, 2) comprenant au moins deux étages d'engrenage, et - un boîtier (G) logeant le moteur électrique (E) et le dispositif d'engrenage (1, 2). L'unité d'entraînement (A) comprend un support d'engrenage (3) qui est fixé dans le boîtier (G) et sur lequel sont montés rotatifs au moins un engrenage (21) d'un premier étage d'engrenage et au moins un engrenage (22) d'un second étage d'engrenage.
PCT/EP2022/056283 2021-03-16 2022-03-11 Unité d'entraînement pour une bicyclette électrique, comprenant un support d'engrenage pour le montage d'engrenages de deux étages d'engrenage WO2022194684A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22713933.4A EP4308444A1 (fr) 2021-03-16 2022-03-11 Unité d'entraînement pour une bicyclette électrique, comprenant un support d'engrenage pour le montage d'engrenages de deux étages d'engrenage
CN202280021753.3A CN117043050A (zh) 2021-03-16 2022-03-11 具有用于支承两个传动级的齿轮的传动机构支架的用于电动自行车的驱动单元
US18/550,053 US20240158047A1 (en) 2021-03-16 2022-03-11 Drive unit for an electric bicycle having a gearing support for mounting gears of two gearing stages

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021202574.9A DE102021202574A1 (de) 2021-03-16 2021-03-16 Antriebseinheit für ein Elektrofahrrad mit Getriebeträger für die Lagerung von Zahnrädern zweier Getriebestufen
DE102021202574.9 2021-03-16

Publications (1)

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WO2022194684A1 true WO2022194684A1 (fr) 2022-09-22

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US (1) US20240158047A1 (fr)
EP (1) EP4308444A1 (fr)
CN (1) CN117043050A (fr)
DE (1) DE102021202574A1 (fr)
WO (1) WO2022194684A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012103355A1 (de) * 2012-04-17 2013-10-17 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Antriebseinrichtung für ein Elektrorad
CN111846102A (zh) * 2020-08-18 2020-10-30 雅迪科技集团有限公司 一种中置电机及电动助力自行车

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5749429A (en) 1995-04-03 1998-05-12 Suzuki Kabushiki Kaisha Power assist apparatus of power assisted bicycle
CN203111431U (zh) 2013-02-04 2013-08-07 苏州盛亿电机有限公司 电动自行车中置电机装置
DE102019111028A1 (de) 2019-04-29 2020-10-29 Pinion Gmbh Getriebeanordnung, Antriebseinheit und Verfahren zum Betreiben einer Antriebseinheit für ein Fahrzeug

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012103355A1 (de) * 2012-04-17 2013-10-17 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Antriebseinrichtung für ein Elektrorad
CN111846102A (zh) * 2020-08-18 2020-10-30 雅迪科技集团有限公司 一种中置电机及电动助力自行车

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US20240158047A1 (en) 2024-05-16
DE102021202574A1 (de) 2022-09-22
EP4308444A1 (fr) 2024-01-24
CN117043050A (zh) 2023-11-10

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